280
FNCA52 TJSJ 100730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST SUN MAY 10 2026
DISCUSSION
BREEZY EASTERLY TRADE WINDS, COUPLED WITH A DRYING AIR MASS, WILL
LEAD TO ELEVATED FIRE WEATHER CONCERNS TODAY, PARTICULARLY ACROSS
THE SOUTHERN COASTAL PLAINS OF PR. LATEST SOIL MOISTURE AND FUEL
ASSESSMENTS INDICATE KEETCH-BYRAM DROUGHT INDEX (KBDI) VALUES ARE
CURRENTLY RANGING FROM 501 TO 669 ALONG THE SOUTHERN COAST. THIS
INDICATES SIGNIFICANT SOIL MOISTURE DEFICITS AND HIGHLY RECEPTIVE
10-HOUR FUELS, PARTICULARLY IN SOUTHWESTERN PR. MINIMUM RELATIVE
HUMIDITY VALUES ARE FORECAST TO DROP INTO THE LOW 50S.
CONCURRENTLY, A TIGHT LOCAL PRESSURE GRADIENT WILL SUSTAIN BREEZY
EASTERLY SURFACE WINDS OF 16 TO 22 MPH, WITH GUSTS UP TO 30 MPH.
THE COMBINATION OF RECEPTIVE FUELS, STRONG AND GUSTY WINDS, AND
LOWERING RELATIVE HUMIDITY WILL RESULT IN AN ELEVATED FIRE DANGER
ALONG THE SOUTHERN COASTAL PLAINS.
PRZ014-102000-
SOUTHEAST COASTAL PLAINS-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 50
TEMP (24H TREND) 90 (+2) 72 (-1) 90
RH % (24H TREND) 55 (0) 91 (+4) 54
WIND 20FT/EARLY(MPH) E 18 E 13 E 17
WIND 20FT/LATE(MPH) E 18 NE 11 E 17
MIXING HGT(FT-AGL/MSL)5690 5780
TRANSPORT WND (MPH) E 20 E 17
VENT RATE (KT-FT) 96730 86700
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-102000-
SOUTHERN HILLS-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 30
TEMP (24H TREND) 86 (+3) 68 (-3) 86
RH % (24H TREND) 60 (0) 97 (+8) 60
WIND 20FT/EARLY(MPH) E 14 E 11 E 13
WIND 20FT/LATE(MPH) E 14 E 12 E 13
MIXING HGT(FT-AGL/MSL)6100 6170
TRANSPORT WND (MPH) E 18 E 16
VENT RATE (KT-FT) 97600 86380
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-102000-
NORTH COASTAL PLAINS-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 30
TEMP (24H TREND) 90 (+2) 72 (-1) 90
RH % (24H TREND) 57 (-2) 96 (+6) 57
WIND 20FT/EARLY(MPH) E 16 E 17 E 16
WIND 20FT/LATE(MPH) E 19 E 12 E 19
MIXING HGT(FT-AGL/MSL)5840 5630
TRANSPORT WND (MPH) E 20 E 18
VENT RATE (KT-FT) 99280 90080
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-102000-
NORTHERN HILLS-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 0 30
TEMP (24H TREND) 88 (+2) 70 (-1) 89
RH % (24H TREND) 57 (-2) 96 (+4) 57
WIND 20FT/EARLY(MPH) E 14 E 13 E 14
WIND 20FT/LATE(MPH) E 17 E 9 E 17
MIXING HGT(FT-AGL/MSL)6190 6240
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 86660 81120
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-102000-
WEST COAST-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 0 30
TEMP (24H TREND) 91 (+1) 72 (0) 91
RH % (24H TREND) 56 (-2) 94 (+5) 57
WIND 20FT/EARLY(MPH) E 16 E 12 E 14
WIND 20FT/LATE(MPH) E 17 E 10 E 14
MIXING HGT(FT-AGL/MSL)5410 5660
TRANSPORT WND (MPH) E 14 E 12
VENT RATE (KT-FT) 64920 56600
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-102000-
EASTERN INTERIOR-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 87 (+2) 70 (-2) 87
RH % (24H TREND) 60 (0) 97 (+5) 61
WIND 20FT/EARLY(MPH) E 16 E 12 E 14
WIND 20FT/LATE(MPH) E 16 E 12 E 13
MIXING HGT(FT-AGL/MSL)6390 6500
TRANSPORT WND (MPH) E 18 E 17
VENT RATE (KT-FT) 102240 97500
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-102000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 82 (+3) 68 (-3) 82
RH % (24H TREND) 67 (-2) 100 (+5) 69
WIND 20FT/EARLY(MPH) E 14 E 10 E 12
WIND 20FT/LATE(MPH) E 14 E 10 E 12
MIXING HGT(FT-AGL/MSL)5140 5110
TRANSPORT WND (MPH) E 20 E 17
VENT RATE (KT-FT) 87380 76650
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-102000-
CENTRAL MOUNTAIN RANGE-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 0 30
TEMP (24H TREND) 87 (+5) 66 (-2) 88
RH % (24H TREND) 59 (-2) 97 (+5) 58
WIND 20FT/EARLY(MPH) E 11 E 8 E 10
WIND 20FT/LATE(MPH) E 11 E 8 E 10
MIXING HGT(FT-AGL/MSL)6410 7070
TRANSPORT WND (MPH) E 14 SE 12
VENT RATE (KT-FT) 76920 70700
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-102000-
CAYEY MOUNTAIN RANGE-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 50
TEMP (24H TREND) 82 (+2) 68 (-2) 82
RH % (24H TREND) 66 (+1) 99 (+4) 66
WIND 20FT/EARLY(MPH) E 13 E 9 E 12
WIND 20FT/LATE(MPH) E 13 E 10 E 12
MIXING HGT(FT-AGL/MSL)5640 5820
TRANSPORT WND (MPH) E 21 E 18
VENT RATE (KT-FT) 101520 93120
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-102000-
VIEQUES-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 87 (+1) 74 (-2) 87
RH % (24H TREND) 61 (0) 91 (+5) 62
WIND 20FT/EARLY(MPH) E 19 E 17 E 17
WIND 20FT/LATE(MPH) E 17 E 17 E 14
MIXING HGT(FT-AGL/MSL)4180 3670
TRANSPORT WND (MPH) E 23 E 20
VENT RATE (KT-FT) 83600 62390
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-102000-
CULEBRA-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 89 (+2) 76 (-1) 89
RH % (24H TREND) 58 (-4) 89 (+5) 60
WIND 20FT/EARLY(MPH) E 19 E 18 E 17
WIND 20FT/LATE(MPH) E 17 E 17 E 14
MIXING HGT(FT-AGL/MSL)4130 3670
TRANSPORT WND (MPH) E 23 E 17
VENT RATE (KT-FT) 82600 55050
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-102000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 10
TEMP (24H TREND) 91 (+2) 72 (-2) 91
RH % (24H TREND) 52 (-3) 89 (+6) 52
WIND 20FT/EARLY(MPH) E 21 E 19 E 20
WIND 20FT/LATE(MPH) SE 23 G30 E 12 SE 20
MIXING HGT(FT-AGL/MSL)5530 5800
TRANSPORT WND (MPH) E 22 E 20
VENT RATE (KT-FT) 105070 98600
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-102000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 20
TEMP (24H TREND) 86 (+1) 75 (-3) 86
RH % (24H TREND) 61 (-2) 91 (+8) 63
WIND 20FT/EARLY(MPH) E 19 G26 E 17 E 17
WIND 20FT/LATE(MPH) E 17 E 17 E 16
MIXING HGT(FT-AGL/MSL)4030 3650
TRANSPORT WND (MPH) E 24 E 20
VENT RATE (KT-FT) 84630 62050
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-102000-
ST CROIX-
330 AM AST SUN MAY 10 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 50
TEMP (24H TREND) 87 (+1) 74 (-2) 87
RH % (24H TREND) 62 (-1) 92 (+6) 64
WIND 20FT/EARLY(MPH) E 18 E 17 E 17
WIND 20FT/LATE(MPH) E 17 E 17 E 16
MIXING HGT(FT-AGL/MSL)4680 4860
TRANSPORT WND (MPH) E 21 E 21
VENT RATE (KT-FT) 84240 87480
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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